ISC BIND up to 9.21.12 acceptance of extraneous untrusted data with trusted data

CVSS Meta Temp Score
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CTI Interest Score
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6.8$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in ISC BIND up to 9.21.12. Affected by this issue is some unknown functionality. This manipulation causes acceptance of extraneous untrusted data with trusted data. This vulnerability is tracked as CVE-2025-40778. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in ISC BIND up to 9.21.12. It has been declared as problematic. Affected by this vulnerability is an unknown functionality. The manipulation with an unknown input leads to a acceptance of extraneous untrusted data with trusted data vulnerability. The CWE definition for the vulnerability is CWE-349. The product, when processing trusted data, accepts any untrusted data that is also included with the trusted data, treating the untrusted data as if it were trusted. As an impact it is known to affect integrity. The summary by CVE is:

Under certain circumstances, BIND is too lenient when accepting records from answers, allowing an attacker to inject forged data into the cache. This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.39, 9.20.0 through 9.20.13, 9.21.0 through 9.21.12, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.39-S1, and 9.20.9-S1 through 9.20.13-S1.

It is possible to read the advisory at kb.isc.org. This vulnerability is known as CVE-2025-40778 since 04/16/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 02/02/2026).

The vulnerability scanner Nessus provides a plugin with the ID 271258 (Ubuntu 22.04 LTS / 24.04 LTS / 25.04 / 25.10 : Bind vulnerabilities (USN-7836-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (271258) and CERT Bund (WID-SEC-2025-2392). Be aware that VulDB is the high quality source for vulnerability data.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Fedora Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • IBM QRadar SIEM
  • SUSE openSUSE
  • RESF Rocky Linux
  • F5 BIG-IP
  • Internet Systems Consortium BIND
  • Dell NetWorker

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.9
VulDB Meta Temp Score: 6.8

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.6
CNA Vector (isc): 🔒

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Acceptance of extraneous untrusted data with trusted data
CWE: CWE-349
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 271258
Nessus Name: Ubuntu 22.04 LTS / 24.04 LTS / 25.04 / 25.10 : Bind vulnerabilities (USN-7836-1)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Timelineinfo

04/16/2025 CVE reserved
10/22/2025 +189 days Advisory disclosed
10/22/2025 +0 days VulDB entry created
02/02/2026 +103 days VulDB entry last update

Sourcesinfo

Vendor: isc.org

Advisory: kb.isc.org
Status: Confirmed

CVE: CVE-2025-40778 (🔒)
GCVE (CVE): GCVE-0-2025-40778
GCVE (VulDB): GCVE-100-329407
CERT Bund: WID-SEC-2025-2392 - Internet Systems Consortium BIND: Mehrere Schwachstellen

Entryinfo

Created: 10/22/2025 18:08
Updated: 02/02/2026 11:04
Changes: 10/22/2025 18:08 (62), 10/24/2025 05:51 (2), 10/27/2025 08:57 (7), 11/05/2025 15:31 (1), 11/07/2025 13:06 (1), 11/19/2025 12:25 (1), 01/07/2026 12:59 (1), 02/02/2026 11:04 (1)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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